VecPackGetColoring

 Gets the coloring required for computing the Jacobian via finite differences on a function defined using a VecPack "grid"

Synopsis

#include "petscda.h"     
PetscErrorCode PETSCDM_DLLEXPORT VecPackGetColoring(VecPack vecpack,ISColoringType ctype,ISColoring *coloring)
Collective on DA

Input Parameter

vecpack - the VecPack object
ctype - IS_COLORING_GLOBAL or IS_COLORING_GHOSTED

Output Parameters

coloring -matrix coloring for use in computing Jacobians (or PETSC_NULL if not needed)

Notes: This currentlu uses one color per column so is very slow.

Notes: These compute the graph coloring of the graph of A^{T}A. The coloring used for efficient (parallel or thread based) triangular solves etc is NOT yet available.

See Also

ISColoringView(), ISColoringGetIS(), MatFDColoringCreate(), ISColoringType, ISColoring, DAGetColoring()

Level:advanced
Location:src/dm/da/utils/pack.c
Index of all DA routines
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